1.in an x-ray tube,electrons striking a target are brought to rest,causing x-rays to be emitted.in a particular x-ray tube,the maximum frequency of the emitted continuum x-ray spectrum is F0,if the voltage across the tube is doubled,the maximum frequ

1.in an x-ray tube,electrons striking a target are brought to rest,causing x-rays to be emitted.in a particular x-ray tube,the maximum frequency of the emitted continuum x-ray spectrum is F0,if the voltage across the tube is doubled,the maximum frequ x-ray in You need an X-ray.为什么X-ray前面是an?X不是元音字母啊? an X-ray machine 为什么要用an 关于X-ray,关为什么X-ray前面用an而不用a. x-ray You must get an X-ray. 改为祈使句 Have you ever had an X ray?请回答 have you ever had an X -ray?如何翻译? It is necessary for you to take an X-ray. 英语翻译2.2.Characterization of OMS-22.2.1.XRDXRD experiments were done using a Scintag XDS 2000 X-ray diffractometer using a tube voltage of 45 kV and a tube current of 40 mA with Cu Kα radiation.The instrument was calibrated using α-quartz as 英译：The very heart of a TV is the picture tube.It is a cathode-ray tube with an electron gun and a phosphor screen inside the evacuated glass envelope. 英语翻译The traditional output device of a person computer has been the CRT (Cathode Ray tube) monitor.Just like a television set (an older one,anyway) the CRT monitor contains a large cathode ray tube that uses an electron beam of varying streng X-RAY是什么意思 x-ray是什么 x-ray啥意思? X一ray是什么意思 X-ray什么意思